Table 4. Country-based distribution (n=70, %) of articles (n=1637) published from 2002 to December 2020

n
% of 1637
USA
350
21.381
AUSTRALIA
186
11.362
ENGLAND
174
10.629
SPAIN
145
8.858
BRAZIL
109
6.659
JAPAN
107
6.536
FRANCE
80
4.887
CANADA
77
4.704
GERMANY
74
4.520
PORTUGAL
64
3.910
TURKEY
61
3.726
AUSTRIA
54
3.299
ITALY
50
3.054
SOUTH KOREA
47
2.871
GREECE
46
2.810
CHINA
45
2.749
NEW ZEALAND
41
2.505
FINLAND
32
1.955
POLAND
32
1.955
SLOVENIA
28
1.710
TAIWAN
28
1.710
BELGIUM
27
1.649
SWITZERLAND
25
1.527
TUNISIA
19
1.161
CROATIA
18
1.100
IRAN
18
1.100
NETHERLANDS
18
1.100
QATAR
17
1.038
SOUTH AFRICA
17
1.038
SWEDEN
17
1.038
WALES
15
0.916
MALAYSIA
14
0.855
ESTONIA
13
0.794
CHILE
12
0.733
NORWAY
12
0.733
SCOTLAND
12
0.733
SINGAPORE
12
0.733
IRELAND
11
0.672
LITHUANIA
11
0.672
CZECH REPUBLIC 
10
0.611
HUNGARY
10
0.611
NORTH IRELAND 
10
0.611
SERBIA
10
0.611
INDIA
6
0.367
ISRAEL
6
0.367
DENMARK
5
0.305
INDONESIA
3
0.183
COLOMBIA
2
0.122
KOSOVO
2
0.122
RUSSIA
2
0.122
SAUDI ARABIA
2
0.122
SLOVAKIA
2
0.122
BOSNIA HERCEG 
1
0.061
BULGARIA
1
0.061
COSTA RICA
1
0.061
CYPRUS
1
0.061
ECUADOR
1
0.061
EGYPT
1
0.061
ICELAND
1
0.061
KENYA
1
0.061
LIECHTENSTEIN
1
0.061
MACEDONIA
1
0.061
MEXICO
1
0.061
MONTENEGRO
1
0.061
NEPAL
1
0.061
NIGERIA
1
0.061
PHILIPPINES
1
0.061
ROMANIA
1
0.061
U ARAB EMIRATES
1
0.061
UKRAINE
1
0.061